I'm having her practice safe water and food at home this summer. There are oocystic organisms endemic there, so chlorine dioxide is the only practical chemical treatment unless filtered first. That means either Micropur MP1 tablets (expensive water) or Aqua Mira (PITA to use - and D.R. doesn't like it). We can debate other chemicals ad nauseum, but keeping it fairly simple for her is one of my goals - she's smart and attentive, but not a gearnut like most of us here.

More on this in my reply to Pete.